.playground {
    width: 525px;
    height: 550px;
    margin: 20px auto 0 auto;
    position: relative;
    background-image:url("../img/tetris.png");
}
.playground img { position: absolute;}
.playground p {font-size: 30px;
    font-family: 'SimHei';
    font-weight: bold;
    color: #667799;
    position: absolute;
    left:305px;
    top:120px;
}
.playground p+p { top:176px; }
.playground p+p+p { top:232px; }